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Finding the Fourth Proportional to 863.75, 1,191.98 and 470.77

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Solution

The fourth proportional to 863.75, 1,191.98 and 470.77 is: 649.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.75 : 1,191.98 = 470.77 : x
  2. Step 2: Convert to fraction form
    863.75/1,191.98 = 470.77/x
  3. Step 3: Cross multiply
    863.75x = 1,191.98 × 470.77
  4. Step 4: Simplify right side
    863.75x = 561,148.42
  5. Step 5: Solve for x
    x = 561,148.42/863.75
  6. Step 6: Final answer
    x = 649.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.